lily/moment-scheme.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1999--2010 Han-Wen Nienhuys <hanwen@xs4all.nl>
   5
   6   LilyPond is free software: you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published by
   8   the Free Software Foundation, either version 3 of the License, or
   9   (at your option) any later version.
  10
  11   LilyPond is distributed in the hope that it will be useful,
  12   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14   GNU General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "moment.hh"
  21
  22 /* TODO: add optional factor argument. */
  23 LY_DEFINE (ly_make_moment, "ly:make-moment",
  24            2, 2, 0, (SCM n, SCM d, SCM gn, SCM gd),
  25            "Create the rational number with main timing @var{n}/@var{d},"
  26            " and optional grace timing @var{gn}/@var{gd}.\n"
  27            "\n"
  28            "A @dfn{moment} is a point in musical time.  It consists of"
  29            " a pair of rationals (@var{m},@tie{}@var{g}), where @var{m} is"
  30            " the timing for the main notes, and @var{g} the timing for"
  31            " grace notes.  In absence of grace notes, @var{g}@tie{}is zero.")
  32 {
  33   LY_ASSERT_TYPE (scm_is_integer, n, 1);
  34   LY_ASSERT_TYPE (scm_is_integer, d, 2);
  35
  36   int grace_num = 0;
  37   if (gn != SCM_UNDEFINED)
  38     {
  39       LY_ASSERT_TYPE (scm_is_integer, gn, 3);
  40       grace_num = scm_to_int (gn);
  41     }
  42
  43   int grace_den = 1;
  44   if (gd != SCM_UNDEFINED)
  45     {
  46       LY_ASSERT_TYPE (scm_is_integer, gd, 4);
  47       grace_den = scm_to_int (gd);
  48     }
  49
  50   return Moment (Rational (scm_to_int (n), scm_to_int (d)),
  51                  Rational (grace_num, grace_den)).smobbed_copy ();
  52 }
  53
  54 LY_DEFINE (ly_moment_sub, "ly:moment-sub",
  55            2, 0, 0, (SCM a, SCM b),
  56            "Subtract two moments.")
  57 {
  58   LY_ASSERT_SMOB (Moment, a, 1);
  59   LY_ASSERT_SMOB (Moment, b, 2);
  60
  61   Moment *ma = unsmob_moment (a);
  62   Moment *mb = unsmob_moment (b);
  63
  64   return (*ma - *mb).smobbed_copy ();
  65 }
  66
  67 LY_DEFINE (ly_moment_add, "ly:moment-add",
  68            2, 0, 0, (SCM a, SCM b),
  69            "Add two moments.")
  70 {
  71   LY_ASSERT_SMOB (Moment, a, 1);
  72   LY_ASSERT_SMOB (Moment, b, 2);
  73
  74   Moment *ma = unsmob_moment (a);
  75   Moment *mb = unsmob_moment (b);
  76
  77   return (*ma + *mb).smobbed_copy ();
  78 }
  79
  80 LY_DEFINE (ly_moment_mul, "ly:moment-mul",
  81            2, 0, 0, (SCM a, SCM b),
  82            "Multiply two moments.")
  83 {
  84   LY_ASSERT_SMOB (Moment, a, 1);
  85   LY_ASSERT_SMOB (Moment, b, 2);
  86
  87   Moment *ma = unsmob_moment (a);
  88   Moment *mb = unsmob_moment (b);
  89   return (*ma * * mb).smobbed_copy ();
  90 }
  91
  92 LY_DEFINE (ly_moment_div, "ly:moment-div",
  93            2, 0, 0, (SCM a, SCM b),
  94            "Divide two moments.")
  95 {
  96   LY_ASSERT_SMOB (Moment, a, 1);
  97   LY_ASSERT_SMOB (Moment, b, 2);
  98
  99   Moment *ma = unsmob_moment (a);
 100   Moment *mb = unsmob_moment (b);
 101
 102   return (*ma / * mb).smobbed_copy ();
 103 }
 104
 105 LY_DEFINE (ly_moment_mod, "ly:moment-mod",
 106            2, 0, 0, (SCM a, SCM b),
 107            "Modulo of two moments.")
 108 {
 109   LY_ASSERT_SMOB (Moment, a, 1);
 110   LY_ASSERT_SMOB (Moment, b, 2);
 111
 112   Moment *ma = unsmob_moment (a);
 113   Moment *mb = unsmob_moment (b);
 114   return (*ma % * mb).smobbed_copy ();
 115 }
 116
 117 LY_DEFINE (ly_moment_grace_numerator, "ly:moment-grace-numerator",
 118            1, 0, 0, (SCM mom),
 119            "Extract numerator from grace timing.")
 120 {
 121   LY_ASSERT_SMOB (Moment, mom, 1);
 122
 123   Moment *ma = unsmob_moment (mom);
 124
 125   return scm_from_int64 (ma->grace_part_.numerator ());
 126 }
 127
 128 LY_DEFINE (ly_moment_grace_denominator, "ly:moment-grace-denominator",
 129            1, 0, 0, (SCM mom),
 130            "Extract denominator from grace timing.")
 131 {
 132   LY_ASSERT_SMOB (Moment, mom, 1);
 133   Moment *ma = unsmob_moment (mom);
 134
 135   return scm_from_int64 (ma->grace_part_.denominator ());
 136 }
 137 LY_DEFINE (ly_moment_main_numerator, "ly:moment-main-numerator",
 138            1, 0, 0, (SCM mom),
 139            "Extract numerator from main timing.")
 140 {
 141   LY_ASSERT_SMOB (Moment, mom, 1);
 142   Moment *ma = unsmob_moment (mom);
 143
 144   return scm_from_int64 (ma->main_part_.numerator ());
 145 }
 146
 147 LY_DEFINE (ly_moment_main_denominator, "ly:moment-main-denominator",
 148            1, 0, 0, (SCM mom),
 149            "Extract denominator from main timing.")
 150 {
 151   LY_ASSERT_SMOB (Moment, mom, 1);
 152   Moment *ma = unsmob_moment (mom);
 153
 154   return scm_from_int64 (ma->main_part_.denominator ());
 155 }
 156
 157 LY_DEFINE (ly_moment_less_p, "ly:moment<?",
 158            2, 0, 0, (SCM a, SCM b),
 159            "Compare two moments.")
 160 {
 161   LY_ASSERT_SMOB (Moment, a, 1);
 162   LY_ASSERT_SMOB (Moment, b, 2);
 163
 164   Moment *ma = unsmob_moment (a);
 165   Moment *mb = unsmob_moment (b);
 166
 167   return ly_bool2scm (*ma < *mb);
 168 }
 169